Question

(1 point) Archeologists have discovered a sample of ancient Egyptian skulls from two different time periods, 4000 B.C. and 150 A.D. They believe that the mean maximum skull breadth (the width of the skull at its widest part) has increased from 4000 B.C. to 150 A.C.A sample of 13 Egyptian skull breadth (in mm) from each time period is show below: 4000 B.C. 118, 125, 134, 129, 122, 129, 132, 129 150 A.D. 132, 131, 137, 140, 142, 134, 132, 128 Part 1: Calculate the mean and standard deviation for each data set. Round each mean to 2 decimal places, and each standard deviation to 4 decimal places. 4000 B.C. mean: 150 A.D. mean: 4000 B.C. standard deviation: 150 A.D. standard deviation:

Answer 1

Solution:

4000 B.C. Mean = 127.25

4000 B.C. Standard deviation = 5.2847

150 A.D. Mean = 134.50

150 A.D. Standard deviation = 4.7809

All Answers are correct and calculated by R Software

R Program:

x=c(118,125,134,129,122,129,132,129)
x
sd(x)
mean(x)

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x=c(132,131,137,140,142,134,132,128)
x
sd(x)
mean(x)

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